Heterostructure multilevel binary optics.

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Diffractive optical elements (DOEs) are crucial for manipulating light.
• Achieving high diffraction efficiency in DOEs requires precise control over feature dimensions, particularly height.

Purpose of the Study:

• To present a method for fabricating multilevel diffractive elements (kinoforms) with highly accurate level heights.
• To demonstrate the capability of achieving high diffraction efficiencies using the proposed method.

Main Methods:

• The method employs conventional deposition technology.
• It utilizes selective etching techniques.
• Multimask lithography is a key component of the fabrication process.

Main Results:

• The developed method enables the formation of heterostructure multilevel binary optical elements.
• High diffraction efficiencies are attainable due to accurate level height control.
• A reflective multilevel element for 10.6-microm radiation was successfully designed, recorded, and tested.

Conclusions:

• The presented method offers a viable approach for fabricating high-efficiency diffractive optical elements.
• The technique integrates standard fabrication processes for practical application.
• This work validates the design and performance of a specific 10.6-microm reflective element.